the window isnt open anytime and why should I catch more than 1 or 2 at a time? It takes time to even sell a single one of them, catching more makes no sense if no buyer is available

20% chance to catch a goby -> 50% chance to have a wahoo -> 20% chance its hq -> 50% chance for titanic saw

sums up to 1% catchrate per cast, which is easy manageable if you start the window with a HQ wahoo